Arrow: 10 Major Predictions For Season 5
3. Prometheus Will Be Someone We Know
The new Big Bad of Arrow is considerably different to the last one, representing the most obvious move away from magic and mysticism.
Prometheus (not connected to the DC villain of the same name) will be someone connected to Oliver's past, affected by his action as the Hood. Since then he's spent years training to be prepared to take him on, and now he's finally making his move.
Although he'll be appearing in the Season 5 premiere, no casting has been revealed for the character yet, and it'd be strange if they were keeping his identity secret without a good reason. And the best reason they'd have for doing that would be if Prometheus is someone we already know.
The biggest fan theory right now is that it's Tommy Merlyn, altered by Flashpoint and out for revenge. It's an interesting twist, though I'm not sure how it'd work once Flashpoint's reversed (unless he's resurrected in some other way, but the show has done a lot of that already). He's the most obvious contender, but Arrow has been through a lot of characters, and it seems very likely he'll be someone we know in some shape or form.